Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
pham duy » pham duc
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
so sach » so sanh, bo sach, co sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thue ((tang van) or (dang van)) hoi. hieu va pham duy ((va hanh) or (va danh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thue ((tang van) OR (dang van)) hoi. hieu va pham duy ((va hanh) OR (va danh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: so sach thue ((tang van) or (dang van)) hoi. hieu va pham duy ((va hanh) or (va danh)) vi cua te*.